I have a RPM shiftlight mounted and installed, but am struggling to get an RPM feed for it. I have wired directly from the ECU, and while it works perfectly when sitting in the garage, for some unknown reason it sucks all power out of the car when trying to drive it, so that option is out.
At the advice of someone on here, I have bought one of these :
But I have no idea where exactly to connect it/wire it in etc. I'm assuming it's on a coilpack ? If so, which one ? And where would you get switching power from in the engine bay for this ?
Has anyone done one of these ?